Will I ever have peace of mind after a percs addiction?

Absolutely. The basis of recovery is to restore peace of mind that addiction destroyed. Working a program consistently and with your heart is your best hope. Look at people who have what you want.
Support. A support group can be very helpful in these circumstances. I would suggest seeking out a celebrate recovery or narcotics anonymous group near you. You can have peace of mind after an addiction but you need the help of a supportive group of people who have already made the journey to show you the way.